Lock nut



Jan. 12 1926. f A1,569,237

L..RAvlER vLoox NUT I original Filed` Dec- 15. 1920 SIS Patented Jan. 172, 1,926.'

UNITED STATES l 1,569,237 PATENT or-rica.

LorLn Enviar., or rants, FRANCE.

LOCK NUT.

Original application fil-ed December 15, 1920, Serial No. 430,813. Divided and this application illed November 2, 1922.

To all whom it may concern:

Be it known that I, LoroLD RAVIER, a

citizen of the French Republic, resident of ing the threaded rod of a tightening ele` ment, such as a bolt, and engaging the conical surface of the lock-nut, said ring being independent of the nut. f

Various arrangements, in accordance with this invention, are illustrated by Way of example in the accompanying drawing' where:

Fig. 1 is a section of the preferred form of this invention, f

Fig. 2 is a section of the lock-nut, which forms part of the arrangement, according to Fig. 1.

Figs. 3 and 4 are respectively a section and a plan of the resilient conic' ring included in the combination according to Fig. 5 is a section of a variation of said resilient conicring.

Fig. 6 is a section of a variation of th preferred form of the invention.

Fig. 7 is a section of a lock-nut which can be included in the construction of the above mentioned Variations.

Fig. 8 is a section of a lock-nut which can be substituted for the lock-nut according to Fig. 1.

Fig. 9 is a section of a lock-nut which can be used instead of the lock-nut according to- Fig. 6.

Fig. 10 is a section ofl a lock-nut whichl can be used instead of the lock-nut according to Fig. 7.

Fiv. 11 is a section of a straining bolt to which our device, according to Fig. )1, 4is applied.v y J t ig. 1 represents a bolt provided with a threaded rod 1, and a. head 2, intended to connect two pieces 3 and 4. The tightening device consists of a nut 5, alock-nut 6,

and aresilient conic Serial No. 598,507.

'rod l of the bolt carries an extension 29.

with a cylindrical outer surface and a truncated inner surface 14. The angle of lsaid cone is smaller than the angle of the conic ring 7.

The lock-nutl 6 is made resilient by a radial saw cut 27 extending from top to bottom of the nut. The elasticity of said lock-nut may be increased by a certain number of radial saw cuts provided either at 27" in the cap' or at 28 in the cylindrical portion 29, Fig. 2, or by any other suitable combination of these different Asaw cuts. The lock-nut 6 may also be made resilient by providing radial saw cuts 28 in the cylindrical portion 29 only. The nut 5 is screwed on to the threaded rod 1 of the bolt; its upper part presents a truncated conical recess 26; the angle of said conical surface is always equal to the difference between the angles of'the cone 14 of the lock-nut 6 and of the cone of the extensible conic ring 7, whatever said angles maybe.

The resilient conic rino 7 (Figs. 3 and 4) has a conical outer sur ace, its inner surface is cylindrical and tapped along its full depth to fit the thread of the bolt.' The ring n 7 is slit by a radial saw cut 17. The elasticity of said ring may be increased by providing on the periphery a certain number of partial radial saw cuts, that isl to say, saw.

lcuts which cut the ring on a fraction of its thickness only. Either of the two bases of the ring 7 may be provided with a, certain number of notches suchv as 18, or other cavities intended to permit'engagement by a special key for screwin The ring 7, instead of' being tapped may be bored along its full depth.

The special shape of the resilient conic ring illustrated in Fig. 5 is tapped along a portion of its depth to fit thel pitch of the engagement with the recess 26. The angles of the cones beingl as aforesaid, the resilient cylindrical extension 29, being engaged by its part 14 with the resilient conic y no I ring 7, expands and fills up the free space provided between the conic surface of the ring 7 and the conic surface of the recess 26.` Such extension 29 at the same time compresses the resilient conic ring 7, the threads of which tightly wedge those of the bolt and lock the parts together. i

In the same arrangement the recess 26 of the nut 5 may be cylindrical and correspond to the cylindrical part 29 of the resilientlock-nut 6. In such case the angle of the cone 14 is equal, to the angle of the cone of the ring 7.

Fig. 6 shows, in the locked position, a modification of the arrangement according to Figs. 1 and 2. In this arrangement the recess provided in the upper part of the nut 30 is tapped `to any pitch, right hand, or left hand, preferably smaller than the pitch of the bolt. The cylindrical extension 31 of the lock-nut 32 is externally threaded righthanded or left-handed,whilst the inner recess of said lock-nut is not tapped, but bored with a diameter greater than the diameter of the rod 1 of the bolt. The angle of the cone 14 of the extensionl 31 is equal to the angle of the cone of the resilient ring 7 which is engaged as before (Fig. .1) in the recess of the nut 30. The resiliency of the lock-nut 32 is obtained by the means described in the case of Figs. 1 and 2 and applied to the resilient lock-nut 6 in said figures. The adjustment is obtained in a manner similar to that of the foregoing arrangement, the lock-nut 32 being screwed with the nut 30.

The resilient lock-nut 32 according to Fig. 6 may be replaced by a resilient lock nut 35,

.as in Fig. 7, the head of which is internally threaded to the pitch of the bolt its elasticity being obtained by all the means described with reference to Fig. 2. The external threading of the extension 31 as well as the threading .which corresponds to the notch 38, provided in the upper part of the nut 30, must fit the pitch of the bolt and be right-handed only. All the threadings 0f the same pitch as the nut, lock-nut and bolt, must duly correspond. The modification of the arrangement which is obtained by replacing the lock-nut 32 in Fig. 6 by the locknut 35 is similar to that of the arrangement in Fig. 1.

The exterior shape of the various nuts described may be of any description, and some lock-nuts may have particular shapes, according to the uses, to which they are to be put. For instance, the extensible lock-nut 6 (Figs. 1 and 2) may have the sha e of a cap-nut 36 (Fig. 8), made resilient y any of the methods previously described, as for example, by means of the saw cut 27.

The lock-nut 32 in Fig. 6 may have the shape of a cap nut 42, as shown in Fig. 9, and the lock-nut 35 in Fig. 7 may have the shape of a cap-nut 40 (Fig. 10). The capnuts 40, 42 may be made resilient by any of the modes ypreviously described.

All the above types of right-hand tapped lock nuts find numerous applications in all industries, and may also be made similarly with a left-handed pitch. They apply to bolts of any shape and to any mechanical threaded element, screws, transmission bearings, fixings for fish plates, motor car brake rods, stretchers, mu couplings, etc.

Fig. 11 illustrates, by way of example, the application of the preferred form of this invention to a straining or tensioning bolt. The central rod is threaded right-handed and engages the tapped central bore of the' sleeve 54. The said sleeve has a truncated recess 26 in which is lodged a resilient conic ring 7, screwed on to the threaded rod 55. A resilient lock-nut 6 similar to the locknut shown in Fig. 1, is screwed on to the rod 55. The resilient extension 29 of said resilient lock-nut 6, by expanding, fills up the free space provided between the conicl surface of the ring 7 and the conic surface of the recess 26 of the sleeve 54, and such extension 29 compresses at the same time the rin 7, the threads of which tightly wedge those of the threaded rod 55 and lock the device.

In a similar arrangement the recess 26 of the sleeve 54 of the straining device may be cylindrical and correspond to the cylindrical part 29 of the resilient lock-nut 6. In such a case the angle of the cone of the lock-nut is equal to the angle of the cone of the resilient ring 7.

I claim as my invention:

1. In a nut-lock device, the combination of a nut, an extensible lock-nut in engagement with said nut, and an extensible conical ring both in engagement with the stem of a tightening member, e. g. a conical surface of said lock-nut, said ring being separate from said nut.

2. The combination with a screw-bolt, or the like, of a nut having a recess, a lock-nut provided with aresilient extension having a conical inner surface, the said extension being adapted to engage in the recess of the said nut, and a resilient conical ring independent of the said nut adapted to engage both the said screw-bolt and the inner conical surface of the extension of the said lock-nut, thereby both locking the said resilient conical ring on the said screw-bolt and tightening the extension of the said lock-nut against the side of the recess in the said nut.

3. The combination with a screw-bolt, of

-a nut having a recess, a resilient lock-nut provided Witha resilient extension having a conical inner surface, the said extension being adapted to engage in the recess of the said nut, and a resilien't conical ring ina screw bolt, and I llO dependent of the said nut adapted to engage both the said screw-bolt and the'1nner conical surface of the extension of the said lock-nut, thereby both locking the said resilient conical ring on the said screw-bolt and tightening the extension of the said lock-nut against the side of the recess in the said nut.

4. The combination with a screw-bolt, or the like, of a nut having a-recess, a lock-nut provided with an extension having a conical inner surface, the -said extension being adapted to engage the recess of the said nut,

the same radial sawcut rendering both the said lock-nut and its extension resilient,

and a resilient conical ring independent of I the said nut adapted to engage both the said.

soy

screw-bolt and the inner conical' surface of the extension of the said lock-nut thereby both locking the said resilient conical ring on the said screw-bolt and tightening the extension of the said lock-nut against the side of the recess of the said nut.

5. The combination with a screw-bolt, or the like, of a nut having a truncated recess,

a lock-nut provided with' a vresilient exten` sion having a cylindrical outer surface and a conical inner surface, the said extension being adapted to engagein the recess of the said nut, and av resilient conical ring independent of the said nut adapted to engage both the said screw-bolt and the inner coni-' cal surface of the extension of the vsaid lock-nut, the angle of the cone of the recess in the said nut being equal to the `differenceV between' the angle of the cone of the' said resilient conical ring and the angle of the inner surface of the extension of the said locknut, said extension upon engaging the said resilient conical ring therefore expanding and filling up the space provided between ,the said, ring and the conical side of the recess of the said nut.

6. The combination with a screw-bolt or the like, ofa nut having a truncated recess, a resilient lock-nut provided with a' resilient extension having a cylindrical'outer surface and a conical inner surface, the said extension adapted toengage in the recess of said nut,- and a resilient conical ring independent of the said nut adapted to engage both the said screw-bolt and the inner conical surface of the extension of the said -lock-nut, the angle of the cone of the recess in the said nut being equal to the difference between the angle of the cone of the said resilient conical i'ingand the angle ofthe inner surface of 7. The combination with a screw-bolt, orv

the like, of a nut having a truncated recess, a lock-nut provided with an extension having a cylindrical outer' surface and a conical inner surface, tlie said extension being adapted to engage in the recess of the said nut, radial saw-cuts rendering both the said lock-nut and its extension resilient, and a resilient conical ring independent of the 'said nut, adapted to engage both the said screw-bolt* and the inner conical surface of the 'extension of the said lock-nut, the angle of the cone of the recess of the said nut being equal to the difference between the angle of the cone of the said resilient conical ringand the angle of the inner surface 'of the extension ofthe said lock-nut, the said extension upon engaging the said resilient conical ring expanding and filling up the space provided between the said 'ring and the conical wall of the recess of the said nut. In testimony whereof I aiiix my signature.

LOPOLD RAVIER. 

